Site dead, Admin works. Cache related? (2 posts)

UPDATE: Straight after posting, the site seemed to come back up. Not sure why. Sorry can't delete post.

Hi, I was working on a second sidebar for the pages on my site (not posts) and somewhere along the way my site pauses and doesn't open anyhing, one browser says its recieved 4k but fails to ever deliver the whole page.
I've restored the theme file to its previous setup but still no dice. I've switched back to the default theme, again nothing.
I can access the admin pages and see everything, pages, setting, posts all are visible, just nothing on the root folder & its blog.
I'm running no speed enhancers or URL rewrites and running 2.0.2 which doesn't use CACHE anymore.
Where do I find the log file and/or possible old cache file?
Ideas would be welcome.